Add keycloak to nginx to avoid editing of /etc/hosts

Description

• If we want to use the keycloak currently for local development you have to edit the /etc/hosts to include 127.0.0.1 keycloak
• The aim of this issue is to provide the possibility to use the keycloak locally without having to edit the /etc/hosts

Acceptance criteria

• remove the 127.0.0.1 keycloak entry from the /etc/hosts
• make sure you've removed the volume of the keycloak-postgres service so that the keycloak service gets initialized using the keycloak-init.json
• I can start the orchestration repo with ./up-with-dev.sh
• there are default values in the docker-compose.yml
• the following environment variables can be commented in the .env:
  • DJANGO_HELMHOLTZ_CLIENT_ID
  • DJANGO_HELMHOLTZ_CLIENT_SECRET
  • DJANGO_HELMHOLTZ_AAI_CONF_URL
  • GF_AUTH_GENERIC_OAUTH_SCOPES
  • GF_AUTH_GENERIC_OAUTH_CLIENT_ID
  • GF_AUTH_GENERIC_OAUTH_CLIENT_SECRET
  • GF_AUTH_GENERIC_OAUTH_AUTH_URL
  • GF_AUTH_GENERIC_OAUTH_TOKEN_URL
  • GF_AUTH_GENERIC_OAUTH_API_URL
• I can log in with one of the users provided by keycloak see specification
  • TSM Frontend: /frontend
  • Grafana: /visualization